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On the new 9100 equiped bike to be delivered, I would like to use my 'old' 9000 stages left crankarm. The look doesn't really match, but as temporarily setup, does it technically work? I guess so, as you could use a 105 stages arm on a 9000 crankset according to Stages.

And instead of opening a new tread, I can ask here, as it's related : would you choose Stages again (I've been very, very pleased with it, in all regards) or go 4iiii. The latter is lighter, supposedly more accurate but only has 100 hours battery life vs 200 hours for Stages. @ 15 hours/week, this a not an un-important thing to keep in mind... Any user experience here with 4iii!?

Would the use of heat shrink on the left arm have a effect on power readings? Using this woud a) protect the crank from shoe rubbing and b) give the crank a stealth look. But I'm afraid this will have a slight effect on the bending behiour of the crank, or am I too concerned?

I'm using a 9000 left arm with 4iiii Precision PM. I use it with the 9000 crankset on my road bike, and a 7800 crankset on my CX bike.Absolutely no issues ( bought and installed last winter).Changed the CR2032 battery once since, it took approx. 8 seconds to do so.Louis